(04-14) 19:01 PDT SAN FRANCISCO -- A report of a person under a BART train at the Montgomery Street Station in San Francisco closed the station and caused major delays at the outset of the Monday evening commute, authorities said.

It was not immediately known how the person ended up under the train just before 5 p.m., but witnesses reported seeing the person jump.

Crews were able to free the person, said BART police Lt. Michael Hayes, and the victim was taken to a hospital with a head injury.

The station remained closed for about 30 minutes as police investigated.

Service was restored about 5:45 p.m., but officials warned commuters to expect delays.